Never trust people who smile constantly. They're either selling something or not very bright.
Laurell K. Hamilton (2002). “Burnt Offerings: An Anita Blake, Vampire Hunter Novel”, p.327, Penguin
![Never trust people who smile constantly. They're either selling something or not very bright.](http://cdn.myquotes.org/images/laurell-k-hamilton/never-trust-people-who-smile-constantly-theyre-either-selling-something-or-not-very-bright.jpg)
Never trust people who smile constantly. They're either selling something or not very bright.